Revision: Light and Sound

Light is a form of energy that travels _____________

• in straight lines called beams.

• in a wavelike motion.

• when particles in air collide into each other.

• from our eyes onto objects around us.

Fill in with an appropriate word: Sound travels when _____________ next to the sound source vibrate and collide into each other.

Objects, such as the sun, that produce and emit their own light are called

• Transparent

• Luminous

• Non-Luminous

• Opaque

Mark all the luminous sources

• stars

• a lit candle

• TV

• moon

Light travels in a ____________ line from a light source directly into our _____________ .

• curve, ear

• straight, eye

• vibrating, eye

• parallel, eye

Choose all statements that apply

Light can be:

• refracted or reflected only by opaque objects

• reflected, refracted, absorbed or blocked

• Absorbed by mirrors.

• blocked by transparent objects.

The light ray emerging from a light source is called:

• Refractive Ray

• Reflected Ray

• Incident Ray

Choose True or False

Light travels faster than sound in all matter

• False

• True

A material that allows some light to pass through, that produces light/fuzzy shadows is called:

• Translucent

• Opaque

• Transparent

• Visible

Definite, dark shadows are formed when an ____________ object blocks all light, creating darkness.